# I Symbol

The latin letter i is used in mathematics to represent the complex part of a complex number. The symbol is also used in computing and some operators as an index variable.

Format Display Data
TeX
i
Unicode i
105


## Usage

Imaginary Number | Notation

The letter i is used in mathematics to represent the square root of negative one.

Complex Number | Notation

A complex number is represented in two parts. The first is the real number part and the second is the imaginary number part.